[Gmsh] Create curvature surface with three line by gmsh

[Nguyen Dung]

Hi you and sorry for unprofessional my. I can't write English
I have error when create  curvature surface with three line

Surface is sad down or protrude
Detail in file attached with mail. Hope you read  it.
Thank you, Sir.
-- 
Nguyễn Dũng
SDT: 0166 2687 355
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